Ejector



C. F. HIGGINS AND J. GUNN.

EJECTOR.

APPLICATION FILED Novx 8. 1919.

1,31 3.733D Patented Apr- 25, 1922.

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EJECTOR.

APPLICATION FILED Nov. 8. I9I9.

Patented Apr. 25, 1922.,

2 SHEETS-SHEET 2.

* uNiTsosrarI-:s PAriENroFr-"lce,

A CHARLES FRANCIS HIGGINS, or LONDON, AND JAMES GUNN, or nAImow-IN-FUBNESS,

ENGLAND.

. EJECTOB.

Specification of Letters Patent. I PatentediApr. 25, 192.2.

Application mea November s, i919. sealan. 336,612.4

To all lwhom. t'may concern.'

Be it known that we, CHARLES s HIGGINS and JAMES GUNN, both subjects of the King of Great Britain, and residents of London, England, and Barrow-in-Furness, England, respectively, have invented certain. new and useful Improvements in Ejectors, of which the following is a specification'.

This invention lrelates to apparatus for withdrawing fluids by means of ejectors.

IWhen discharging aerated vapour or gas against a pressure by means of an ejector 'and particularly a steam operated ejector, it

is known that unless'the combining tube into which the jet discharges is sufliclently filled, the uniformity and continuity of fiow through the tube is disturbed by reason of the increased tendency to back flow, and the discharge becomes erratic and intermittent thereby causing instability of the ejector; and the greater the pressure difference under which the ejector works, the greater will be the degree of instability from this cause. To obviate this defect it has been suggestedto introduce from without the system additional air or other elastic iiuid into the system and with the object of reducingwr checking the expansion of the operating fluid passing through the expanding nozzle or nozzles at starting additional fluid has been admitted to the nozzle or nozzles at one Ior more intermediate points along its or their length. The present invention differs from the former of these proposals in that the elastic fluid employed is essent'iallyuid j already contained in the system and it dif'- fers from the latter proposal in'that accord- -ing to our invention the fluid is by-passed pass circuit on the ejector itself sothat acirculation of elastic fluid takes place from the throat of the ejector or thereabouts back again to a position behind the throat. This by-pass circuit may be provided with a by-pass and in addition to or in lieu of this throttling device means' may be provided for varying'the position or width ofthe opening orl openlngs in the wall of the throat and through which the fluid passes to the suction slde of the ejector.

According to another arrangement we may cause steam oraerated vapour or gas already in the system to by-pass from one part of the system to another, the device by which the byapass is effected being controlled by some Suitable form of valve. This valve may be an automatic valve adapted to open and close in accordance with the pressure or vdegree of vacuum in some suitable part of the system, such for instance, as in an intermediate condensing receiver.

In Fig. 1 of the accompanying drawings we have illustrated. diagrammatically an ejector constructed in accordance with our lnvention.

Fig. 2 is a similar lview illustrating a modified form of ejector. v

' Fig. 3 is a longitudinal section showing another form of our invention, while Fig. 4 is a transverse section on line A-A of Fig. 3. l i

Upon reference to Fig. 1 it will be seen that the ejector is provided with a by-pass circuit constituted by the passage 24 which leads from the opening 3 in the throat back to a position 1 behind the'throat.

It may be desirable and advantageous in some cases'to provide for varying the position or area of the opening in the throat, and this may be accomplished in the manner indicated in Fig. 2. In this case the throat comprises the sleeves 4 and 5 which are slidable upon the fixed portions 6 and 7 and it will be readily seen that by-alteration of the positions of these sleeves 4 and 5 both the width of the throat opening 3 and its position can be adjusted to suit the requirements of any particular case. v

In Figs. 3 and 4 ,we have shown a further constructional form of our invention as ap plied to an ejector. In this case the by-pass circuit is constituted as before by the passage 2 which leads from an opening 3 in the throat back to a position 1 behind the throat, adjustment and control being provided for by means of an annular throttle valve 8 operated from the shaft 9 through an eccentric pin 10, so that the annular valve8 can be.

What We claim and desire to secure by` l Letters Patent is 1. Means for stabilizing an ejector comprising a by-pass passage leading from a single opening located essentially in the throat of the ejector to the suction side or convergent portion of the combinlng tube of said ejector substantially as specifie 2. Means for stabilizing an ejector comprising a by-pass passage leading from a single opening located essentially in the throat of the ejector to the suction sideor convergent portion of the combining tube of said ejector and alvalve for adjusting the eective area of tially'as specified.

3. An lejector comprising a steam jet and combining tube and a by-pass passage leadthe throat opening substan' `ing from a single opening inthe throat of prising a by-pass passage leading -fromA al single opening located essentially in the throat of -the4 ejector to the suction side or convergent portion of the combining tube of said ejector and means for adjusting the position of said throat opening longitudinally of said ejector substantially as specified.

5. Means for stabilizing an ejector comp rising a by-pass .passage leading from a single openin located essentially in the throat of the ejector to the suction side of the combining tube of said e'ector and means for adj ustin the position o said throat opening longitudinally of saidejector and means for varying the effective area of said throat opening substantially as specified.

n Witness whereof We aix our signatures. CHARLES FRANCIS HIGGINS. JAMES GUNN. 

